Centrifugal pump



March 13, 1956 c. ANDERMATT ET AL 2,737,898

CENTRIFUGAL PUMP Filed Sept. 26, 1950 2 Sheets-Sheet 1 IN VENTOR ATTORNEY March 13, 1956 Filed Sept. 26, 1950 C. ANDERMATT ETAL CENTRIFUGAL PUMP 2 Sheets-Sheet 2 INVENTOR (1 424 fin/05pm M/vawr l/HELI.

ATTORNEY United States Patent ()ihce 2,737,898 CENTRE" fiI'IMP' earrmiaerma't't, Rusehhko -end'vineeht (when; Winter'tliur, Switzerland Gl'aiins priority, applicatiods'v'i'itzerlanil' September 2851949 Claims"; (Ci. 1155:4655

i t b th th heme 6 1 e thereapimp ar ere w l 6f the ca ing; It ifsfalso; k ow '3 the liquid lies close oii the eghn the ot er side at the blade is (:Qvered wetter; h r e a h n det i n fi t Q hwm eyer uch pumps cannot be employedwithput aux'-' IHQQIVCQITI merit for the pumping emerge a v ligfiid c 'ol'uirrin is interrupted by the air. get in h bie'a'e the wheel and that an injector-t'y 'psiietioh eifeet is nside these channels. I in filial Pump ry out thi a p'i'ov ed on opposite walls forming the tvv 11 blades, these grooves giving sue inere' in the cross section of the p he ae em anying drawings, seleced oi'ih Eject of the invention are illusti'atetl by'ivy' of example. In the drawingsi V Fig 1 is a partial axial section of a eeiitiifiigal dancewith the invention; r UN F a Eross section taken appfoiiiniatly bit the" Erie id 4 are fragmeritary aiiial s ctioiis ilhis'triih other e bodiriient's'; i

Figs; 5 55a 6 are chess sees-eras sin'iilar is Fig. 2 Brit illustrating other embodiments.

The embodiment of the invention shownin Figs. 1 and 2 comprises two eoa'r'rial discs 1 and 2 which aft? spaced from one another. The disc 1 has a hub portion 6 which, as illustrated in Fig. 2, is mounted on a shaft 7,,theshaft tiirig oinit'te'd in Fig. 1. The disc 2 h s a huh hert eh 621: which there is piovided a eeiit'fal openiiig 8 that pr'oi'ides ajii inlet assage for the Betweh the discs 1 ehaz, there are provided a plui'alit'y of eiitfviira 'y reaming blades or vanes 4 which eh heet' the tw'o dis'cs. eir'c imfetentia'll spaced blades 4, together wi'thth aiiially' spa'ced discs 1 and 2, define a plilralitv of fluid channels 3 communicating with; and radiating out from, the ,inlet opening 8. a W E h a. Ufipo'fsite siirfaces of the channels 3 feiiiied by th discs 2 are provided with a series of g ooves 5 eh are aiia'p'ioximatly concentric With the discs. and he extiiil tra'i isvei'sely to the direction of fluid flbw out through of saw-teeth cenen mels 3. The grooves 5 are e fi'giirtidn, being defined by the intersection of anfifilar 1f l with has" elther been forced out of so tion 1'" was 2,737,898 Patented Mar. 13, 1956 5d approiiiinatflypeifiehdiciilaf to the dir etioh elfloyv er fluid saidcliinnels' Faii'd annular satraees 5 which ere" incline "iiially ihwa'rq 'teward the op pjosit'e dis' and fadia lly" ehtwaraiy. The iii'tefsectioni of t liejs llrf aesisa arid 5b fehiis ciieiinifrfitially extending riil'ges 5c which alternatewith the" grooves" 5, as" shown. Iii d idual g rboi e s" 5 iii the tivb' discs are disposed apliiEiXlii'iiflYdfifidSiidii aridih r and fiio vide sudden inereajs s iiithe' ehaiiiie erase" semen; This configuration of "ushrt es fthe'channels'j3 preduce'stiirbulerice' 'd S0- that a fluid ddiiipi'is irig liqilid and is iha d a" fiiiited state; separatien (if the liqilid a'iid gasph'ases aii'd the aeeiirriiila'tiofi ojt'gas along the wall tces erthe e s are ther'ehy inhibited, It has been f lthat'piiifipsi eeeefae ee'wi h the iiiv'iition' can be peratedjvitli a If her siitidii lief-id than centrifugal ofcohveiitjib a1" des'i'gii, evefi-thoiig'li the fluid contains a s nb's'tantiall ihduh't 5f gas.

Afilit eliibodiriient of the invention is illustrated in Fig. 3' which eofrespoiiding'p'arts ar'edesig'nated b'j the same reference numerals as in Fig. 1 with theaddition of 10. The pump comprises a non-rotating wall disc 11 andlzi r'ota'tiiighub 16 earr'yifig a plufality of Circumferentially sp" i 2 having a central poraced hljadeh l l and a dis 1 1:65 iii Whih there is fbifiied ati inlet passage 18. The bllades' o'r vanes 14, together with the non-rotating I11 i'bjfafifig' dish" 12 defi1i a pluralitj 0f fltlid ehaiinels is ret i'itihg' oiit herh' the inlet passa e s, The disc" 11 aiid IZ' are provided with grooves 15 which corf'spdiid t6 the: grbdvs 5 of 1 iid are of Saw-tooth eftiss se on. The grooves 15 eYt'efid iii an appreximat'edii fntitil dir'e 6h so as; to be disposed trans- Zffijrse the; direction of flQWdf fluid in the channels 13. The edges 6f the v aiis I4 adjaderit t h dist: 11 are of s a :tse'th ehh g'hr'etiea as it; fit into the grooves 15. I I the arses 11 and 12, there is provided a partition ring I9 Whichi's" ea'rfied by the vanes" 14 and eitends inf from the peripheries er the discs 11 aid 12. The phrhh'eh i9 thiis divides the outlet portioiis (if each of the elifaii'ne'ls' sgihte weights; Mere than she ring could, of eoiifs', be firbiiid'e'd so that each er the channels is diyidd ihto a eerrespehamg nuiiiber of parts. Grooves 15 of sew-teeth cross 's'e" ion, e'errespehdin to the r" is, are pier/idea 6h die 6? Beth feces of the partitidii 'r'i i'g" 19.

A third iiihbdihiefit of tli iiii eiitioii is illustrated in Fi l Wliih' cdiiesfidndiiig' 5.f designated by the 1 j ffei-als as" ih Fig.1 with the addition of 20. In this embodiiii'nt', a dise 21 aiid circumferentially spaced blades or vanes 24 rotate with a hub 26 while a s'iiiid disc hivii'ig a ehtralppehi g 28 formed in a liiib portion 266: is statiofiaiv. The discs 21 and 22 are provided on their inner faces with: oppositely disposed gio'di s dr reees's''s 25 which are of sew-teeth cross section and eirtendtrafisiiefselv to: the direction of flow of fltiid h'fitiver'diy through chaiiiiels' 2's defined by the discs Hand 22 aha the vanes 24. The edges of the vanes 24 "iatidfiar'y disc; 22 are of saw-tooth shape so as to fit ihtd the grooves 25, g

Another modification is illustrated in Fig. 5 which corresponds ii; gerier 'al to Fig. 2 arid in which corresponding parts aife desigfiatedbv the same reference numerals as in Fig, 2 with the additiori of 30. As in the embodiments desc'rib'ed above, the iiuii p comprises a pair of axially spaceddi'ses, o'iie of which is indicated at 31, the other A hub portion 36 is adjae iiit' the siiiif tooth ess as illiistra'ted in Fig. 1. Similar giiioi es' as" are provided on the varies s4.

A further modification is illustrated in Fig. 6 which corresponds in general to Fig. 2 and in which corresponding parts have been designated by the same reference numerals as in Fig. 2 with the addition of 40. The embodiment of Fig. 6 is similar to those described above and comprises axially spaced discs one of which is indicated at 41 while the other is not shown. A hub 46 is mounted on a shaft 47 and blades 44 are provided between the two discs. The circumferentially spaced blades or vanes 44, together with the axially spaced discs, define a plurality of outwardly radiating channels 43. Additional blades 49 extend inwardly from the peripheries of the discs and divide the outlet portions of the channels 43 into two parts. The inner faces of the disc 41 and the axially spaced opposite disc (not shown) are provided with grooves 45 which are of saw-tooth cross section like the corresponding grooves of the embodiments described above. The grooves need not be strictly concentric with the discs so long as they extend transversely to the direction of flow of fluid in the channels 43. The vanes 44 and 49 are provided with similar saw-tooth grooves 45' which likewise extend transversely to the direction of fluid flow.

What we claim is:

1. In a centrifugal pump for handling fluids comprising a mixture of liquid and gas, said pump having a pair of annular concentric axially spaced walls having opposite inner faces cooperating together to form a pumping chamber, one of said walls having a central inlet opening to said pumping chamber and at least one of said walls being rotatable, a plurality of circumferentially spaced vanes extending axially from one of said walls to the other and dividing said pumping chamber into a plurality of fluid channels communicating with and radiating out from said inlet opening, said vanes being fixed to said rotating wall to rotate therewith, the opposite inner faces of said walls having a series of radially spaced concentric annular grooves, the grooves in one face having the same radial spacing as the grooves in the opposite face so that the grooves in opposite wall faces form concentric pairs, each of said grooves being of saw-tooth cross section and formed by a pair of intersecting surfaces, one of said surfaces extending axially from the bottom of said groove toward the opposite one of said walls and the other of said surfaces extending radially outwardly from the bottom of said groove and being inclined axially inwardly toward the opposite one of said walls, said concentric pairs of grooves cooperating with one another to form successive gradual reductions and sudden increases in said fluid channels to produce a pumping action to keep said liquid and gas mixed and prevent accumulation of gas in said pumping chamber.

2. A centrifugal pump according to claim 1, in which both of said walls rotate together and said vanes are fixed to both of said walls.

3. A centrifugal pump according to claim 1, in which one only of said walls rotates, the other being stationary, and in which said vanes are fixed to said rotating wall and extend into the grooves of said stationary wall.

4. In a centrifugal pump for handling fluids comprising a mixture of liquid and gas, said pump having a pair of annular concentric axially spaced walls having opposite inner faces cooperating together to form a pumping chamber, one of said walls having a central inlet opening to said pumping chamber and at least one of said walls being rotatable, a plurality of circumferentially spaced vanes extending axially from one of said walls to the other and dividing said pumping chamber into a plurality of fluid channels communicating with and radiating out from said inlet opening, said vanes being fixed to said rotating wall to rotate therewith and having opposite axially extending faces, the opposite inner faces of said walls having a series of radially spaced concentric annular grooves, the grooves in one face having the same,

radial spacing as the grooves in the opposite face so that the grooves in opposite wall faces form concentric pairs, each of said grooves being of saw-tooth cross section and formed by a pair of intersecting surfaces, one of said surfaces extending axially from the bottom of said groove toward the opposite one of said walls and the other of said surfaces extending radially outwardly from the bottom of said groove and being inclined axially inwardly toward the opposite one of said walls, said concentric pairs of grooves cooperating with one another to form successive gradual reductions and sudden increases in said fluid channels to produce a pumping action to keep said liquid and gas mixed and prevent accumulation of gas in said pumping chamber, like grooves being formed in at least one of said faces of each of said vanes and extending axially between the opposite inner faces of said walls, said grooves in the vanes cooperating with said grooves in said walls to keep said liquid and gas mixed.

5. In a centrifugal pump for handling fluids comprising a mixture of liquid and gas, said pump having a pair of annular concentric axially spaced walls having opposite inner faces cooperating together to form a pumping chamber, one of said walls having a central inlet opening to said pumping chamber and at least one of said walls being rotatable, a plurality of circumferentially spaced vanes extending axially from one of said walls to the other and dividing said pumping chamber into a plurality of fluid channels communicating with and radiating out from said inlet opening, said vanes being fixed to said rotating wall to rotate therewith, an annular partition disposed between said walls and carried by said vanes, said partition extending radially inwardly from the outer ends of said channels part way to said inlet opening and thereby dividing the outer portion of each of said channels into two parts, the opposite inner faces of said walls having a series of radially spaced concentric annular grooves, the grooves in one face having the same radial spacing as the grooves in the opposite face so that the grooves in opposite wall faces form concentric pairs, each of said grooves being of saw-tooth cross section and formed by a pair of intersecting surfaces, one of said surfaces extending axially from the bottom of said groove toward the opposite one of said Walls and the other of said surfaces extending radially outwardly from the bottom of said groove and being inclined axially inwardly toward the opposite one of said walls, said concentric pairs of grooves cooperating with one another to form successive gradual reductions and sudden increases in said fluid channels to produce a pumping action to keep said liquid and gas mixed and prevent accumulation of gas in said pumping chamber, the opposite faces of said partition being likewise formed with a series of concentric annular grooves corresponding to said grooves in said wall faces and of like cross section and arrangement, said grooves in said partition faces cooperating with said grooves in said wall faces to keep said liquid and gas mixed.

References Cited in the file of this patent UNITED STATES PATENTS 1,083,739 Guyer Ian. 6, 1914 1,320,031 Andrews Oct. 28, 1919 2,101,390 Gorissen Dec. 7, 1937 2,118,681 Macdonald May 24, 1938 2,278,953 Stockham Apr. 7, 1942 2,306,847 Turnbull Dec. 29, 1942 2,439,577 Norton Apr. 13, 1948 FOREIGN PATENTS 447,930 Germany July 29, 1927 491,977 Great Britain Sept. 13, 1938 496,820 Great Britain Dec. 7, 1938 691,098 Germany May 16, 1940 893,205 France June 2, 1944 900,706 France Oct. 16, 1944 

